CEN ISO/ASTM/TR 52912:2020 PDF

Overview

CEN ISO/ASTM/TR 52912:2020 - Additive manufacturing - Design - Functionally graded additive manufacturing (FGAM) is a technical report that presents a conceptual overview of Functionally Graded Additive Manufacturing. Prepared by ISO/TC 261 in cooperation with ASTM F42 and endorsed by CEN/TC 438, the document reviews the state of the art, capabilities, limitations and data‑exchange issues for producing components whose material composition or internal structure varies spatially to meet intended functions.

Key points from the report:

• FGAM builds on Functionally Graded Materials (FGMs) by using layer‑by‑layer AM to vary material structure or composition.
• The report is informative (non‑normative): it clarifies concepts, surveys technologies and recommends strategies for overcoming barriers to wider adoption.

Key topics

• Conceptual framework for FGAM: distinctions between single‑material (graded microstructure) and multi‑material FGAM.
• AM process capabilities: review of process families relevant to FGAM - material extrusion, powder bed fusion, directed energy deposition (DED), sheet lamination - and how each supports grading.
• Material challenges: selection, property prediction, defining optimal property distributions, and tolerancing for graded regions.
• Software and data exchange: CAD/CAE constraints, data formats (e.g., AMF, Fabricatable Voxel concepts) and interoperability issues for representing graded material information.
• Limitations and obstacles: technological constraints, material compatibility, process control and metrology challenges.
• Applications and outlook: current case studies, potential markets, and recommended research directions.

Practical applications

FGAM enables components with spatially tailored performance - examples and targets discussed in the report include:

• Biomedical implants with porous-to-dense transitions for osseointegration and load transfer.
• Aerospace parts with graded thermal or mechanical properties for weight and performance optimization.
• Consumer and industrial parts where site‑specific stiffness, wear resistance or aesthetics are required. Use cases emphasize multifunctional components, integrated assemblies, and designs that reduce part count or improve lifecycle performance.

Who should use this standard

• Design engineers and AM practitioners seeking conceptual guidance on graded designs.
• Materials scientists and process developers exploring multi‑material or graded microstructures.
• CAD/CAE and software vendors addressing data representation and workflow for graded materials.
• Standards bodies, researchers and OEMs looking for a consolidated view of FGAM capabilities, limitations and future directions.

Related standards

• ISO/ASTM 52900 (Additive manufacturing - General principles and vocabulary) - referenced for AM terminology.
• AMF (Additive Manufacturing File format) and voxel‑based data concepts are discussed as relevant data exchange approaches.

Keywords: Functionally Graded Additive Manufacturing, FGAM, additive manufacturing, AM, graded materials, multi‑material AM, AMF, CAD, powder bed fusion, directed energy deposition.